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Federal Emergency Management Agency Washington, D.C. 20472 JUN 022003 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 03-08-0249P The Honorable Noel Busck Mayor, City of Thornton 9500 Civic Center Drive Thornton, CO 80229-4326 Community: City of Thornton, CO Community No.: 080007 Panels Affected: 0800lC0039 G and 0045 G . Ef~ective.~ate of J U l 0'2 2003 This RevislOn: 102-I-C Dear Mayor Busck: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) for Adams County, Colorado and Incorporated Areas (the effective FIRM for your community), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated February 7,2003, P.E., Civil Design Group, Inc., requested that FEMA revise the FIRM to modify the floodplain along an unnamed tributary to Grange Hall Creek (unnamed tributary) to show the effects of construction of Birch Street and 1 05th Avenue and vicinity grading. On the effective FIRM, the Special Flood Hazard Area (SFHA), the area that would be inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base flood), along the unnamed tributary from its confluence with Grange Hall Creek to Colorado Boulevard is designated Zone A, an SFHA with no Base Flood Elevations determined. All data required to complete our review of this request were submitted with letters from L 1 We have completed our review of the submitted data and the flood data shown on the effective FIRM. We have revised the FIRM to modify the floodplain boundary delineations of the base flood along the unnamed tributary. As a result of the modifications, the width of the SFHA for the unnamed tributary increased in some areas and decreased in other areas. The modifications are shown on the enclosed annotated copies of FIRM Panels 08001C0039 G and 0800lC0045 G. This Letter of Map Revision (LOMR) hereby revises the above-referenced panels of the effective FIRM dated August 16, 1995. The modifications are effective as of the date shown above. The map panels as listed above and as modified by this letter will be used for all flood insurance policies and renewals issued for your community. A review of the determination made by this LOMR and any requests to alter this determination should be made within 30 days. Any request to alter the determination must be based on scientific or technical data. We will not physically revise and republish the FIRM for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panels warrant physical